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4. µÎ Ź±¸°ø »çÀÌ¿¡ µå¶óÀ̱⸦ ³Ö°í ¹Ù¶÷À» ºÒ¾î³Ö¾î º¸ÀÚ.
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¼ö¾Æ,Çö¿õ, look .. I prepared these instruments for magic show.
We have 2 ping- pong balls and dryer. I stick them with string and tape. Can you imagine what mummy tries to do?
Look. there is enough space between 2 balls. I can make them get close together without touching them.
What will happen if I blow wind between these 2 balls with dryer?
Yes! They will approach. I¡¯ll show you how.
Do you wanna try? Ok, here it is.
Turn on the hair dryer. À§~~À×!
Cool.
they are getting closer and finally bump into each other!
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